A peak inside another Civil Defense Shelter

My recent tour with Leo Kosonen included another Civil Defense Shelter - this one built with a dual purpose as a sports facility.  It is located in the neighborhood of Petosen.  You can find it on Google Maps.  From the outside, it is clear that it is more that simply a shelter.

Inside, the facility includes both a public swimming pool (Uimahalli), and a ice arena for skating and hockey.

As long as infrastructure for Civil Defense Shelters is required, you might as well make it useful in peaceful times.  I understand that the systems to heat the pool and cool the ice are connected and save energy as a result.  This takes "in-ground pool" to a new level - this one is underground.